import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Flutter Demo", style: TextStyle(color: Colors.white)),
          backgroundColor: Colors.blue,
        ),
        body: HomePage(),
      ),
    );
  }
}

class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    // 获取屏幕的宽高
    // final size = MediaQuery.of(context).size;
    return AspectRatio(
      aspectRatio: 2 / 1,
      child: Container(
        color: Colors.red,
      ),
    );
  }
  // 页面上显示一个容器 宽度是屏幕的宽度 高度是容器的
}
